package com.neuedu.my12306.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class EncodingFilter implements Filter {
	private String filterEncoding="ISO-8859-1";
	public  EncodingFilter() {
	
	}

	@Override
	public void destroy() {
		

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		request.setCharacterEncoding(filterEncoding);
		response.setCharacterEncoding(filterEncoding);
		
		//在doFilter方法内部调用doFilter,把请求传递到下一个过滤器或其它servlet或jsp
		chain.doFilter(request, response);

	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		
		String encoding=filterConfig.getInitParameter("encoding");
		if (encoding!=null) {
			filterEncoding = encoding;
		}
	
	}

}
